Construction Monkey

Wire Table


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This is a simple table to provide you with all of the pertinent NEC code data for wires. If your looking for one place to see all conductor, properties Construction Monkey has it for you.

Conductor Material:
Insulation Type:
Conduit Material Type:
Size Copper Size Impedance1 Max Length2
60°C 75°C 90°C Diameter Area XL RCu Zeff 120V 208V 277V 480V
Per 1000 feet
#14 20 A 20 A 25 A 0.11 in 0.01 in2 0.073 Ω 3.100 Ω 2.67 Ω 42 ft 73 ft 97 ft 168 ft
#12 25 A 25 A 30 A 0.13 in 0.01 in2 0.068 Ω 2.000 Ω 1.74 Ω 52 ft 90 ft 120 ft 207 ft
#10 30 A 35 A 40 A 0.16 in 0.02 in2 0.063 Ω 1.200 Ω 1.05 Ω 61 ft 106 ft 141 ft 244 ft
#8 40 A 50 A 55 A 0.22 in 0.04 in2 0.065 Ω 0.780 Ω 0.70 Ω 65 ft 112 ft 149 ft 258 ft
#6 55 A 65 A 75 A 0.25 in 0.05 in2 0.064 Ω 0.490 Ω 0.45 Ω 77 ft 133 ft 177 ft 308 ft
#4 70 A 85 A 95 A 0.32 in 0.08 in2 0.060 Ω 0.310 Ω 0.30 Ω 90 ft 155 ft 207 ft 359 ft
#3 85 A 100 A 110 A 0.35 in 0.10 in2 0.059 Ω 0.250 Ω 0.24 Ω 92 ft 160 ft 213 ft 369 ft
#2 95 A 115 A 130 A 0.38 in 0.12 in2 0.057 Ω 0.200 Ω 0.20 Ω 98 ft 170 ft 226 ft 391 ft
#1 110 A 130 A 150 A 0.45 in 0.16 in2 0.057 Ω 0.160 Ω 0.17 Ω 104 ft 181 ft 241 ft 417 ft
#1/0 125 A 150 A 170 A 0.49 in 0.19 in2 0.055 Ω 0.120 Ω 0.13 Ω 115 ft 199 ft 264 ft 458 ft
#2/0 145 A 175 A 195 A 0.53 in 0.22 in2 0.054 Ω 0.100 Ω 0.11 Ω 113 ft 196 ft 262 ft 453 ft
#3/0 165 A 200 A 225 A 0.58 in 0.27 in2 0.052 Ω 0.079 Ω 0.09 Ω 119 ft 206 ft 275 ft 476 ft
#4/0 195 A 230 A 260 A 0.64 in 0.32 in2 0.051 Ω 0.063 Ω 0.08 Ω 122 ft 211 ft 281 ft 487 ft
#250 215 A 255 A 290 A 0.71 in 0.40 in2 0.052 Ω 0.054 Ω 0.07 Ω 120 ft 209 ft 278 ft 482 ft
#300 240 A 285 A 320 A 0.77 in 0.46 in2 0.051 Ω 0.045 Ω 0.07 Ω 121 ft 210 ft 280 ft 485 ft
#350 260 A 310 A 350 A 0.82 in 0.52 in2 0.050 Ω 0.039 Ω 0.06 Ω 122 ft 211 ft 282 ft 488 ft
#400 280 A 335 A 380 A 0.86 in 0.59 in2 0.049 Ω 0.035 Ω 0.06 Ω 121 ft 210 ft 279 ft 484 ft
#500 320 A 380 A 430 A 0.95 in 0.71 in2 0.048 Ω 0.029 Ω 0.05 Ω 119 ft 206 ft 274 ft 474 ft
#600 355 A 420 A 475 A 1.05 in 0.87 in2 0.048 Ω 0.025 Ω 0.05 Ω 115 ft 200 ft 266 ft 460 ft
#700 385 A 460 A 520 A 1.12 in 0.99 in2 0.048 Ω 0.023 Ω 0.04 Ω 109 ft 189 ft 252 ft 436 ft
#750 400 A 475 A 535 A 1.16 in 1.05 in2 0.048 Ω 0.021 Ω 0.04 Ω 110 ft 190 ft 253 ft 439 ft
#800 410 A 490 A 555 A 1.19 in 1.11 in2 0.047 Ω 0.020 Ω 0.04 Ω 110 ft 191 ft 254 ft 440 ft
#900 435 A 520 A 585 A 1.25 in 1.23 in2 0.047 Ω 0.019 Ω 0.04 Ω 106 ft 183 ft 244 ft 423 ft
#1000 455 A 545 A 615 A 1.31 in 1.35 in2 0.046 Ω 0.018 Ω 0.04 Ω 104 ft 181 ft 241 ft 418 ft

Notes:

  1. Impedance is calculated utilizing a 0.85 power factor.
  2. Maximum Length is based on 3% of the voltage value given and a power load that is 80% of the 75°C allowable ampacity.

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No guarantees are made as to the accuracy of the calculation or compliance with local codes.  Verify all calculations with a professional engineer. If you find an error, or have a suggestion, please send us an email.

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